Question

If an atom of an element has 34 electrons in total and the number of valence electrons?

• A. N, 26
• B. N, 6
• C. M, 26
• D. M, 2

Answer 1

The correct option is B

N, 6

The atoms have 34 electrons. The electronic configuration using Bohr's rules is 2, 8, 18, 6.

The maximum number of electrons in each shell is as follows

K-Shell will be=$2$ $\times$ $1^2$=$2$

L- Shell will be=$2$ $\times$ $2^2$ = $8$

M- Shell will be= $2$ $\times$ $3^2$ =$18$

N- Shell will be= $2$ $\times$ $4^2$= $32$

The 34 electrons will be filled from inner orbit to outer orbit considering the maximum number of electrons for reach orbit.

So K-shell - 2 electrons, L-Shell -8 electrons, M-Shell -18 electrons and we are left with 6 electrons which can be filled in the next shell that is N.